USPTO Patents Application 09870801

(19)

rr<8f-H JAPANESE PATENT OFFICE

PATENT ABSTRACTS OF JAPAN

(11) Publication number 05258463 A

(43) Date of publication of application: 08.10.93

(51) Int. CI G11B 20/10

H04N 5/91

H04N 5/92

(21) Application number: 04088318

(71) Applicant:

SONY CORP

(22) Date of filing: 13.03.92

(72) Inventor.

OGAWA KAZUYUKI

(54) DEVICE FOR RECORDING AND REPRODUCING
DIGITAL SIGNAL

(57) Abstract:

PURPOSE: To restrict the copying of digital signals
transmitted in a packet mode.

CONSTITUTION: In the recording and reproducing part
13 of a first digital VTR 1, a video tape is set, in
which information for protection against copying
indicating kinds of protection against copying such as
the limitation of the number of times for copying and
parameters such as the availability of the number of
times for copying is recorded, in a predetermined
position. By the first digital VTR 1, reproduced digital
video signals and digital audio signals are converted
into the packet mode, added with a protection bit group,
and transmitted to a second digital VTR 2. By the second
digital VTR 2, the protection bit group is detected, and
if the availability for copying is indicated, the
copying of digital video signals, etc., is performed.

COPYRIGHT: (C)1993,JPO&Japio

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